Feeding device fob die-casting machines



G. W. BUNGAY.

FEEDING DEVICE FOR DIE CASTING MACHINES.

APPLICATION FILED FEB.2I,'1920.

1,41 6 1 Patented May 1 1922.

UNITED STATES PATENT o-FFicE.

GEORGE wALnEMAn BUNGAY; or BROOKLYN, NEW YoEK, AssIsNoR r ACME nIE CASTING- CORPGRATION, a coarortnrion on NEW YORK.

FEEDING DEVICE FOR nrE-cAsrnvG MAGI iifiES.

specification of Letters Patent. Pattn ted Application ma February 21, 1920. Serial No. 350,480.

. T 0 all whom it may concern:

'Be it known that I, GEORG VVALDEMAR BUNGAY, a citizen of the United States, residing inthe borough ofBrooklyn, county of Kings, city and State of New York, have invented certain new anduseful Improvements in Feeding Devices for Die-Casting Machines, of which the followingis a specification.

chines, in which the molten metalfor forming the casting is forced into a die or mold under pressure, and the object of my invention is to produce tight and unleakable joints between the discharge nozzle of the machine and the die or mold, so that the molten metal under pressure will be forced into the die to form the casting, and will not be ejected into the atmosphere. Heretofore, considerable trouble has been experienced by reason of the fact that in use parts of the machine would become warped by the heat so as to prevent the proper seating of the nozzle in the nozzle-receiving recess pro vided for it in the die or othernozzle-receiving part. In order effectively to overcome thisdifliculty, regardless of the partic' ular construction of the die casting machine itself, I havetin. my present invention provided an intermediate bodily and angularly self-adjusting connecting member forming a die-feeding device and adapted to be interposed between the nozzle and the die or other similar part and to be clampedtherebetween as these parts move towards each other in the operation of the machine, it being common practice to have either the 'die or the nozzle, or sometimes both of these parts,moved towards each other into clamping relation and then again to be separated one from the other, in the operation of the machine.

My invention includes features of construction and combinations ofparts, as will appear from the following description.

I shall now describe the embodiment of my invention illustrated in the accompanying drawings and shall thereafter point out my invention in claims. i

Figure 1 is a perspective view of a cliefeeding deviceembodying my invention and which is adapted to be inserted and clamped between the usual nozzle and the usual die member or corresponding part of a die casting machine, the outer end part of the handle of the device being omitted.

Figure 2 is a central verti'cal'section with parts in elevation of the device shown in Figure 1, together with the directly cooperative parts of a die casting machine, and shows the feeding device as clamped in place 1 between the end of the nozzle and one of the V I v e diemembers of the die castingmachinei My 1nvent1on relates to die casting ma The die casting machine attachment or as having at one side thereof an integrally formed projection or boss 2 within which is permanently fixed a projecting handle 3. The head 1 has extending therethrough'cen trally thereof a port or bore 4, shown as gradually tapered from its lower end upwardly and forming through the head ll a supply passage for the molten metal. At the lower end of andsurrounding the bore or passage 4, the block 1 is concavely hollowed out to form a nozzle-r eiving recess or socket 5. At the upper end of the-bore passage 45, the block 1 is provided'with a con vexly curved or outwardly rounded sealing projection 6 in the shape of a ball adapted to be received into and co-ope -itive with a suitable recess in a die or other co-operativ'e part, i r 4 7 My attachment as above described, may be used with different die casting machines of various constructions. The particula-r die casting machine parts of which are illustrated in Figure 2 includes a furnace 7, a melting pot or receptacle 7 and a'pressui' e chamber 8 which terminates in an upwardly directed nozzle 9 having centrally therein a nozzle port 10. In this particular machine the pressure chamber 8-is pivoted on trunnions, one of which 11 appears in the drawsubmerged position'of the nozzle 9 for filling the pressure chamber, and the exposed or castingposition thereof shownin Figure The molten metal may be forced out of the pressure chamber 8 by means of compressed air admitted through the hollow trunnion'll. In this die casting machine, parts of which are illustrated in Figure 2, an apertured supporting" plate or die head 12 supports upon its upper side a lower die member 13, upon which in the operation of the machine; there is adapted to be clamped in the casting position or the parts an upper die member 14, as is shown in Figure 2. The upper die Inember 14 in the operation of the machine is movable to and from the lower die member 13, and so far as my present invention is concerned, the lower die member 13 supported by the plate 12 may be either movably or stationarily mounted, and it may therefore be assumed that this lower. die member 13 and its supporting plate 12 are stationarily mounted in this particular machine.

A mold cavity or. die chamber 15 is shown as formedby a recess in the upper side of the lower die member 13, and this mold cavity or die chamber 15, in the particular construction shown in the drawings, has a downwardly tapered central extension 16, which in its lower part forms an inlet port for the die or mold. In this particular construction illustrated in the drawings, a central tapered core 17 carried by the upper die member 1a projects downward into the upper part of the chamber extension 16 in the lower die member 13. This upper die .member 14- is also shown as provided with ejector pins 18. The lower die member 13 on its lower side surrounding the lower end otthe port-forming chamber extension 16 has therein a spherically concave recess 1.9.

In the operation of the die casting machine, as heretofore operated without my present invention, the spherically convexlv curved end of the nozzle 9 would be seated in the correspondingly contoured recess 19 in the lower. die member 13 with the nozzle port 10 substantially in alignment with the die port formed by the lower end of the chamber extension 16. However, owing to the warping of the various parts of the machine by the intense heat, sometimes there would be more or less relative lateral dis placement of the nozzle-receiving recess 19' and the nozzle end 9, by reason of which an imperfect seal would result, causing the molten metal under pressure to escape into the atmosphere, not only rendering the operation of the machine dangerous but also in many cases spoiling the casting.

In carrying out my invention the head 1 of the feeding device or attachment is. interposed between the recess surface 19 of the lower die member 13 and the upwardly pro jecting nozzle end 9. In the particular construction shown, in order to effect this result the rounded nozzle-like spherically curved convex projection 6 is placed in the recess 19 of the die member 13 during the time that the nozzle 9 of the pressure chamber 8 is depressed, and this head 1, by means of the handle 3, is held in this position until the pressure chamber 8 is, rocked on its trunnions 11, thereby to raise the nozzle 9, the rounded end of which then becomes seated inthe concave recess 5 at the lower end of the passage l in the head 1, and the head 1 thereby is firmly clamped between the nozzle 9 of the movable pressure chain-- ber S and the recess surface 19 of the lower die member 13.

The ported head 1 is perfectly tree to adjust itself both bodily and angularly in all directions, thereby assuring a perfect seating at both ends of this head 1 regardless of its angular position, that is to say, a perfeotly tight seal will be secured between its spherically rounded upper end 6 and the surface 01 the recess 19 01- corresponding contour in the lower side of the die member 13, and also similarly, a perfect seal will be secured between the spherically rounded upper surface of the nozzle 9 and the recess 5. of corresponding contour in the lower end of the head 1. It is clearly evident that the inclination of the duct or passage 4, in the head 1, due to the angular position of this head, will not interfere with the communication of the lower end of this duct with the nozzle passage 10, nor with the upper end of this duct with the inlet port formed by the lower end of the chamber extension 16.

It is obvious that various modifications may be made in the construction shown in.

the drawings .and above particularly de scribed within the principle and scope of my invention.

I claim:

1. A die casting machine having in combination a discharge nozzle provided with an outlet, a die member having an inlet port, a connecting member adapted to be clamped between the die member and the discharge nozzle, said connecting member being provided with a tapered passage communicating with'the inlet port of thedie member and the outlet of said nozzle.

91 A die casting machine having in combination a discharge nozzle provided with an outlet, a die member having an inlet port, a connecting member adapted to be clamped between the die member and the discharge nozzle, said connecting member being provided with a tapered passage communicating with the inlet port of the die member and the outlet of said nozzle, the tapered passage at its smaller end having a diameter not greater than the diameter of the inlet port of said die member.

' 3. A die casting machine having in combination a discharge nozzle provided with an outlet, a die member having an inlet port, a connecting. member adapted to be clamped between the die member and the discharge nozzle, said connecting member being provided with a tapered passage com municating with the inlet port of the die member and the outlet of said nozzle, the tapered passage at its smaller end having a diameter not greater than the diameter of the inlet port of said die member, and at its larger end a. diameter not less than the diameter of the outlet of said discharge nozzle.

4. A. die casting machine lmving in combination a discharge nozzle having an out it let, the end of the nozzle being formed to present a curved face, a diemember having an inlet port and constructed to present a' curved seating surface, and a connecting member having its opposlte ends shaped to provide complementary meeting faces with the curved face of said nozzle and the curved seating surface of said (lie membcr, the connecting member being adapted to be clamped between the die member and the nozzle and provided, with a tapered passage communicating with the inlet port of said die member and the outlet of said nozzle.

In testimony whereof, I have afiixed my signature to this specification.

GEORGE WALDEMAR BUNGAY. 

